Question

10. ABCD is a square in which diagonal AC = 12 cm.​

Answer 1

Step-by-step explanation:

ABCD is a square so ,

AB=BC=CD=AD ......................( 1 )

In train. ABC

AB² + BC² = AC²

So , 2AB² = AC²

2AB² = (12)²

so , AB² = 144/2

AB² = 72

AB = √72

So , Area of square = side² = (√72)² = 72 cm²