Answer:
a. 44 cm b. 126 cm
Step-by-step explanation:
a. it is semi circle
perimeter is πd
22/7*14
44 cm
b. it is equilateral triangle
so perimeter is side* 3
42 *3 = 126cm
The 12,7, and 5 will not make a triangle
L*w=6*20
6*15= 90m
20*15=300m
l*w= 90*300=27000m <-- area