1/2abSinC
1/2*8*5*sin(140)=12.9cm
* means multiply
(4) Halving the value of b
Example #1:
a = 4 , b = 2
x = (4^2) / 2
x = 16 / 2
x = 8
a = 4 , b = 1
x = (4^2) / 1
x = 16 / 1
x = 16
Example #2:
a = 8 , b = 4
x = (8^2) / 4
x = 64 / 4
x = 16
a = 8 , b = 2
x = (8^2) / 2
x = 64 / 2
x = 32
Answer:
2031.36 sq. in.
Step-by-step explanation:
60 minutes is how long it will take her , because she has four walls 20•4 is 60