Question

ABCD is a quadrilateral Ac is diagonal​

Answer 1

Answer:13cm

Step-by-step explanation:according to pythogoreus theorm

a²+b²=c²

Part 1)

Here,a=4

B=3

c=3²+4²=25 or 5²

Thus,AC=5cm

Part 2)a=12cm

b=5cm

= 5²+12²=169 or13²

Thus,DC=13cm

Answer 2

AB² + BC² = AC²

4² + 3² = AC²

16 + 9 = AC²

25 = AC²

5 cm = AC

OR

AC = 5 cm

In Triangle ADC,

By Pythagoras Theorem,

AD ² + AC² = DC²

12² + 5² = DC²

144 + 25 = DC²

169 = DC²

13 cm = DC

OR

DC = 13 cm

Hope it helps you, hv a nyc day