Answer:
Assuming the triangle is an equilateral triangle (all sides and angles are equal), the equation 3x = 20 would be used to find the length of each side.
Step-by-step explanation:
Formula for perimeter of triangle:
P = a + b + c
where a, b and c are the sides of the triangle.
Assuming the triangle is equilateral, all sides would be equal,
a = b = c = x
⇒ P = x + x + x
∴ 20 = 3x.
Answer:
A + B + C = 20 in
A² = B² + C² - 2·B·C·cos(α)
B² = C² + A² - 2·A·C·cos(β)
C² = A² + B² - 2·A·B·cos(γ)
Step-by-step explanation:
The expression for the perimeter of a triangle with sides A, B, C is
Perimeter of triangle = A + B + C = 20 inches
A² = B² + C² - 2·B·C·cos(α)
B² = C² + A² - 2·A·C·cos(β)
C² = A² + B² - 2·A·B·cos(γ)
Where, angle α is the angle opposite of side A
angle β is the angle opposite of side B
angle γ is the angle opposite of side C.
