Question

Find are of an isosceles triangle whose perimeter is 18cm and equal sides are 5cm

Answer 1

Answer:

Isosceles angle = 24

Hope it is useful

Answer 2

Finding 3rd side of the triangle

5 + 5 +x = 18

x= 8 cm

by Pythagoras

x/2 = 4 cm

5 x 5 - 4 x 4 = side^2

25 - 16 =9

side = 3 cm

area of right angle triangle

$\frac{1}{2}$ x B X H

$\frac{1}{2}$ x 4 x 3

Area of right angle triangle = 6 cm^2

Area of 2 right angle triangle is

6 x 2 = 12 cm^2

Area of isosceles triangle = 12 cm^2

THIS IMAGE IS NOT ACCORDING TO QUESTION BUT IT WILL HELP YOU A LITTLE BIT TO UNDERSTAND HOW I HAVE DONE.(SORRY Inconvenience)