In triangle ABC ab=ac and angle b is (2 upon 5)of angle a and all the angle of this triangle.
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∡A = a
∡B = ²/₅ a
∡C = ∡B = ²/₅ a
∡A + ∡B + ∡C = a + ⁴/₅a = ⁹/₅a = 180°
⁹/₅ a = 180
a = 180 × ⁵/₉ = 20 × 5 = 100 = ∡A
∡B = ²/₅ a = 40 = ∡C
Answer: 100°, 40°, 40°.
∡B = ²/₅ a
∡C = ∡B = ²/₅ a
∡A + ∡B + ∡C = a + ⁴/₅a = ⁹/₅a = 180°
⁹/₅ a = 180
a = 180 × ⁵/₉ = 20 × 5 = 100 = ∡A
∡B = ²/₅ a = 40 = ∡C
Answer: 100°, 40°, 40°.
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