Answer:
side lengths are 6, 12, 12, 9, 9
Step-by-step explanation:
The perimeter is the sum of the lengths of the sides:
x + 2x + 2x + (x+3) + (x+3) = 48
7x +6 = 48 . . . . collect terms
7x = 42 . . . . . . .subtract 6
x = 6 . . . . . . . . . divide by 7
Substitute this value into the expressions for the side lengths:
x = 6
2x = 12
x+3 = 9
The side lengths are 6, 12, 12, 9, 9.
The answers are in the attachment
Answer: b
see explanation
To verify cos²A + sin²A = 1 with A = 90° , then
cos²90° + sin²90°
= (0)² + (1)²
= 0 + 1
= 1
