Question

If Each equal side of an Isosceles triangle is 20cm, then its Perimeter is _____
a 20+10√3 cm
b 20√2 cm
c 20+10√2 cm
d 40+10√2 cm
​

Answer 1

B

Step-by-step explanation:

Isoceles triangle has 2 sides equal

Given: 2 sides = 20cm

Third side =

$\sqrt{ {20}^{2} + 20 ^{2} }$

=

$\sqrt{800}$

=

$20 \sqrt{2}$