The side and two angles of the triangle ABC are given. find its third angle if BC = 3.5 cm
| March 20, 2021 | education
The side and two angles of the triangle ABC are given. find its third angle if BC = 3.5 cm, angle B = 40 degrees, angle C = 120 degrees.
The unknown third corner of the triangle is denoted by the conditional variable “Y”.
Considering that the sum of the angles of the triangle is 180 °, we form the following expression: 180 = Y + 40 + 120.
When we count, we get the following total 180 = Y + 160 or Y = 180 – 160 = 20 °.
Answer: The 3rd angle of the triangle is 20 °.
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