Name r 13 EUA 18. Find the measure of angle A Date Period A 16 139° B A= 13 20 19. Solve the triangle ABC with side lengths a =
14cm, b = 9cm, c = 6cm a = A= b = B= C= C =
1 answer:
Answer:
A = 137° a = 14 cm
B = 26° b = 9 cm
C = 17° c = 6 cm
Step-by-step explanation:
<u>Cosine rule</u>
where:
- c is the side opposite angle C
- a and b are the sides with C as the included angle.
Given:
- a = 14 cm
- b = 9 cm
- c = 6 cm
<u>Sine Rule</u>
(where A, B and C are the angles and a, b and c are the sides opposite the angles)
Sum of interior angles of a triangle = 180°
⇒ ∠A + ∠B + ∠C = 180°
⇒ ∠A = 180° - 25.997...° - 16.9912...°
⇒ ∠A = 137.0107361...°
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