Answer:
A = 8π cm²
Step-by-step explanation:
The area (A) of a circle is calculated as
A = πr² ( r is the radius )
Here diameter = 8 , then r = 8 ÷ 2 = 4
The area of half a circle is then
A =
π × 4² =
× π × 16 = 8π cm²
Well flat means open so 180°
180° - 50° = 130° is the answer
Answer:
6ab.
Step-by-step explanation:
3 x a x 2 x b
= 3 x 2 x a x b ( because multiplication is commutative, which basically means you can move the numbers and variables anywhere in the expression).
= 6ab ( we leave out the multiplication signs. They are understood.)
Answer:
1st one, I think so. I'm pretty positive
Answer: See explanation
Step-by-step explanation:
Michael is X years old.
Jenny is twice as old as Michael. Thus means that Jenny = 2 × x = 2x
The sum of their ages is 57.
Therefore, x + 2x = 57
3x = 57
x = 57/3 = 19
Michael is 19 years
Jenny's age = 2x = 2 × 19 = 38 years