Answer: you will use the cosine rule
Step-by-step explanation:
x^2=11^2+8^2-2(11)(8)xcos(16)
x^2=185-169.18
x^2=15.8
Take square root
x=3.96 or 4
All 3 of the listed parallelograms have both pairs of sides parallel, by definition.
The square and the rhombus have all congruent sides.
Since the square and rhombus have all 4 congruent sides, this means their opposite sides are congruent. Additionally, rectangles have opposite sides congruent.
The answer is 92 estimates 90
Answer:
I think it's 12
Step-by-step explanation:
Answer:
∠7 = 81°
Step-by-step explanation:
∠1 = ∠7
3x + 18 = 2x + 39
3x - 2x = 39 - 18
x = 21
∠7 = 2x + 39
∠7 = 2(21) + 39
∠7 = 42 + 39
∠7 = 81°