Find the area of the following figures.
(All measurements are in cm.)
Answers
Answer:
(i)for the first one there are 3 triangles and 1 trapezium
the area formula of traingle is = 1/2× BH
area of trapezium = a+b×h the whole divided by two
1 at traingle = 1/2× 6×2
= 6cm
2nd triangle= 1/2×10× ( 2+5)
= 35cm
trapezium = 6+(5+2)×6
________
2
= 39cm
now add the areas of three triangles and one trapezium
6+35+39=80sq.cm
( ii ) in this There are 2 rectangles and triangles
area formula of rectangle is l×b and triangle is 1/2×bh
1st rectangle = 60×30
= 1800 cm
2nd rectangle =60×25
= 1500 cm
you can see a line indicates 80 cm we know one side of rectangle is 60 cm so 80 - 60 = 20
the double line in both the triangles indicate they are equal so 20/2 = 10 cm
so base of both the traingles is 10cm
area of both the triangles is =2× ( 1/2 ×10×25 )
( since two triangles area we multiply with 2 at initial )
= 2×125
250 cm
now add all the areas of both the rectangles and triangles
= 1800+1500+250
=3550 sq.cm