Course: AllegroLearn Features, Section: Mensuration

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Image: photo-1549228581-cdbdb7430548, by Allegrocy Admin, licence All rights reserved

Section outline

Mensuration

Area of Plane Shapes

Teachers can place simple text and images in a table to explain geometry.


	Triangle Area = ½ × b × h b = base h = vertical height		Square Area = a² a = length of side
	Rectangle Area = w × h w = width h = height		Parallelogram Area = b × h b = base h = vertical height
	Trapezium Area = ½(a+b) × h h = vertical height		Circle Area = π × r² Circumference = 2 × π × r r = radius
	Ellipse Area = πab		Sector Area = ½ × r2 × θ r = radius θ = angle in radians

Questions can also be posted directly on the page

Q1

The diagram shows a circle inside a semicircle.

The circle has a diameter of 20 cm.

The semicircle has a diameter of 40 cm.

Calculate the shaded area. Round your answer to 1 decimal place.

Q2
The diagram shows a triangle ABC.
AB = 8 m, AC = 7 m and BC = 9 m.
a) Work out the size of angle B.
b) Work out the area of triangle ABC.
Give your answers correct to 1 decimal place.
Answers can be hidden in a collapsed section of the page (click to open)