Answer:

14cm b

Step-by-step explanation:

see 2 prime no. so can't a

• 21 dm ÷2. so ohh if u do multi × do 21 +21 ÷ 2

Verified answer

a) side=2.5m

Area= (side)²=(2.5)²=6.25m²

perimeter= 4× side= 4×2.5= 10m

b) side=14cm

Area=(14)²=196cm²

perimeter=4×14=56cm

c) side=21 dm

Area=(21)²=441m

perimeter=4×21=84