**Included Angle of a Triangle (Definition …**
https://tutors.com/lesson/included-angle-of-a-triangle-definition

To find the included angles, start with the sides: Use the sides of the triangle to find the included angles. Use the cosine rule to find an angle when you have two sides and the included angle. If the required included angle is θ, then: 0.5 x 5 x 20 x sin (θ) = 15. By simplifying, we get: sin (θ) = 15 / 50. By calculating the sin inverse, we get: = 17.45 degree. NA and AP include \angle A ∠A between them AP and PN include \angle P ∠P between them PN and NA include \angle N ∠N between them Identify the lengths of two sides of the triangle (a and b) and the length of the included angle (C).

Use the sides of the triangle to find the included angles.

Use the cosine rule to find an angle when you have two sides and the included angle.

If the required included angle is θ, then: 0.5 x 5 x 20 x sin (θ) = 15. By simplifying, we get: sin (θ) = 15 / 50. By calculating the sin inverse, we get: = 17.45 degree.

NA and AP include \angle A ∠A between them

AP and PN include \angle P ∠P between them

PN and NA include \angle N ∠N between them

Identify the lengths of two sides of the triangle (a and b) and the length of the included angle (C).

**DA:** 64 **PA:** 96 **MOZ Rank:** 11