Question

Find the height of triangle whose base is 15 cm and area 120 cm square.the area of the circular tin plate is 38.5 metre square. find its circuference.

Answer 1

Height of triangle makes a perpendicular to the base....

so..

area=1/2×base×height

>1/2×15×height=120

height=120×2/15

therefore height=16 cm

now the second part...

area of of plate(since it is circular) =πr^2

22/7×r^2=38.5

r=√38.5×7/22=0.74cm (approximately)

now circumference=2πr

>2×22/7×0.74

=4.65cm(approximately)