Question

note- I want the explanation ​

Answer 1

Step-by-step explanation:

in an isosceles triangle two sides are equal

so, 9 cm +20cm+20cm =49cm (as given)

hope it helps

Answer 2

Answer:

Perimeter of an isosceles triangle = 2a+b

( 'a' stands for equal sides)

Now perimeter is given as 49 cm.

We know that two sides of an isosceles triangle are equal so if we want perimeter than we can't substitute 9 and 9 as equal sides because it will not sum upto 49 so we will let our equal sides as 20 cm and 20 cm and this will fulfill in making perimeter as 49 cm

Let's substitute it by formula-

2a+b = 49

=> 2×20 +9 = 49

So, 49 = 49

Verified