Area of a triangle (1) 1 Complete the sentences to describe the triangle. The triangle has full squares. The triangle has half squares. The area of the triangle is cm 2 2 Count squares to work out the area of each triangle. a) c) area = cm 2 b) area = cm 2 area = cm 2 3 Count squares to estimate the area of each triangle. a) c) area = cm 2 area = cm 2 b) area = cm 2 Why are your answers estimates? 4 a) Work out the areas of the shapes by counting squares. area = cm 2 area = cm 2 © White Rose Maths 2019 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm area = cm 2 d) 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm 1 cm
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Area of a triangle (1)
1 Completethesentencestodescribe
thetriangle.
Thetrianglehas fullsquares.
Thetrianglehas halfsquares.
Theareaofthetriangle
is cm2
2 Countsquarestoworkouttheareaofeachtriangle.
a) c)
area= cm2
b)
area= cm2 area= cm2
3 Countsquarestoestimatetheareaofeachtriangle.
a) c)
area= cm2 area= cm2
b)
area= cm2
Whyareyouranswersestimates?
4 a)Workouttheareasoftheshapesbycountingsquares.
area= cm2 area= cm2
©WhiteRoseMaths2019
1cm
1cm
1cm
1cm
1cm
1cm
1cm
1cm 1cm
1cm
area= cm2
d)
1cm
1cm
1cm
1cm
1cm
1cm
1cm
1cm
1cm
1cm
b) Whatdoyounoticeaboutyouranswerstoparta)?
Explorethisusingotherrectangles.
c) Writeyourfindings.
5 Drawatrianglethathasanareaofapproximately15cm2
Compareanswerswithapartner.
©WhiteRoseMaths2019
6
DoyouagreewithEva’sestimate?
Talkaboutitwithapartner.
7 Drawtriangleswiththeseareas.
1cm22cm23cm24cm25cm26cm2
Talktoapartneraboutthebeststrategiesfordrawing
thetriangles.
I estimate the size of the triangle to be about 16 cm2
1cm
1cm
1cm
1cm
1cm
1cm
1cm
1cm
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