Mensuration And Calculation
Resumen
This is the topic where knowing which formula to recall is worth as much as using it. There is no formulae sheet in any 9260 paper: the front cover lists a calculator and mathematical instruments and nothing else. Appendix 6.1 of the specification names the formulae you must carry in your head, and several of them live here: the circumference and area of a circle, Pythagoras, the three trigonometric ratios, the sine rule, the cosine rule, the area of a triangle as half ab sin C, the area of a trapezium and the volume of a prism.
You will use standard units of measure and change freely between them, including the compound units of speed and density; apply formulae for the area of triangles, parallelograms and trapezia and for the volume of a solid with a constant cross sectional area; work with the circumference and area of a circle and with composite shapes; and use Pythagoras and the trigonometric ratios in right-angled triangles in two-dimensional figures. On the Extension Tier you add surface area and volume of spheres, pyramids, cones, composite solids and frustums, the relationships between lengths, areas and volumes in similar figures, arc lengths and sectors, trigonometry in three dimensional figures, and the sine and cosine rules.
Objetivos
- [Core] use standard units of measure and related concepts (length, area, volume/capacity, mass, time, money etc); change freely between related standard units (eg time, length, area, volume/capacity, mass) and compound units (eg speed and density) (Notes: 24 and 12 hour clock for times)
- [Core] know and apply formulae to calculate: area of triangles, parallelograms, trapezia; volume of 3D shapes using V = Ah where A is the constant cross sectional area and h is the height/length
- [Core] know and use the formulae: circumference of a circle = 2πr = πd; area of a circle = πr²
- [Core] calculate perimeters and areas of 2D shapes, including composite shapes
- [Extension] surface area and volume of spheres, pyramids, cones and composite solids including composite shapes and frustums of pyramids and cones (Notes: solutions in terms of π may be asked for)
- [Extension] use the relationships between lengths, areas and volumes in similar figures
- [Extension] calculate arc lengths, angles and areas of sectors of circles
- [Core] know the formula for: Pythagoras' theorem, a² + b² = c², and the trigonometric ratios sin θ = opposite/hypotenuse, cos θ = adjacent/hypotenuse and tan θ = opposite/adjacent
- [Core] apply them to find lengths and angles in right-angled triangles in two-dimensional figures
- [Extension] including 3D figures
- [Extension] know and apply the sine rule, a/sin A = b/sin B = c/sin C, and cosine rule, a² = b² + c² − 2bc cos A, to find unknown lengths and angles
- [Extension] know and apply Area = ½ ab sin C to calculate the area, sides or angles of any triangle
Mapa mental
Este tema esta esquematizado para ver como se conectan las ideas.
Abre el mapa mental en la app
Nota de la lección
Apunte completo disponible en la aplicacion Green Bridge
Instala la aplicacion Green Bridge CBT en tu movil u ordenador para acceder a toda la biblioteca IGCSE: examenes anteriores, criterios de correccion, mapas mentales, tarjetas de estudio y lecciones en audio.
Evaluación de la lección
Felicitaciones por completar la lección del Mensuration And Calculation. Ahora que has explorado el conceptos e ideas clave, es hora de poner a prueba tus conocimientos. Esta sección ofrece una variedad de prácticas Preguntas diseñadas para reforzar su comprensión y ayudarle a evaluar su comprensión del material.
Te encontrarás con una variedad de tipos de preguntas, incluyendo preguntas de opción múltiple, preguntas de respuesta corta y preguntas de ensayo. Cada pregunta está cuidadosamente diseñada para evaluar diferentes aspectos de tu conocimiento y habilidades de pensamiento crítico.
Utiliza esta sección de evaluación como una oportunidad para reforzar tu comprensión del tema e identificar cualquier área en la que puedas necesitar un estudio adicional. No te desanimes por los desafíos que encuentres; en su lugar, míralos como oportunidades para el crecimiento y la mejora.
- How many square centimetres are there in one square metre? A. 100 B. 1000 C. 10 000 D. 1 000 000 Answer: C
- A right-angled triangle has a hypotenuse of 73 cm and one other side of 48 cm. What is the third side? A. 25 cm B. 55 cm C. 61 cm D. 87 cm Answer: B
- Two similar solids have corresponding lengths 10 cm and 12 cm. The smaller has volume 500 cm^3. What is the volume of the larger? A. 600 cm^3 B. 720 cm^3 C. 864 cm^3 D. 1000 cm^3 Answer: C
- Which formula will NOT be printed on a 9260 question paper when it is needed? A. The volume of a cone B. The volume of a sphere C. The area of a circle D. The curved surface area of a cone Answer: C
- A triangle has sides 16 cm, 9 cm and 20 cm. Which rule finds the angle opposite the 20 cm side? A. Pythagoras B. The sine rule C. The cosine rule D. Half ab sin C Answer: C
Resuelve estas preguntas en la aplicacion
Resuelve estas preguntas en la aplicacion
Libros Recomendados
Practica preguntas simuladas
¿Quieres practicar preguntas simuladas sobre Mensuration And Calculation? Descarga la aplicación Green Bridge CBT para acceder a preguntas simuladas y evaluaciones completas sobre este tema.
Descarga la aplicación en Google Playstore.
Todo lo que necesitas para destacar en JAMB, WAEC y NECO.
