Question

Please answer ...... By step by step explanation... ​

Answer 1

Step-by-step explanation:

P= 84 cm

l=3x since it is an unknown value

b=4x

p=2(l+b)

84=2(3x+4x)

84=2×7x

84=14x

84/14=x

6=x

3x= 3×6=18 cm

4x=4×6=24 cm

AC^2=AB^2+BC^2

AC^2=18^2+24^2

AC^2=324+576

AC^2=900

AC=√ 900

AC=30

Therefore the diagonal is of 30 cm