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First method
Let the ratio be 2x and 3x
Given
∠a = 2x
∠b = 3x
∠c = ?
To find
⟶ 90⁰ + ∠a + ∠b = 180⁰. ( Linear pair)
⟶ 90⁰ + 2x + 3x = 180⁰
⟶ 90⁰ + 5x = 180⁰
⟶ 5x = 90⁰
⟶ x =
⟶ x =
⭐ ∠a = 2 × 18 = 36⁰
⭐ ∠a = 2 × 18 = 36⁰⭐ ∠b = 3 × 18 = 54⁰
⟶. ∠a + ∠b + ∠c = 180⁰ ( linear pair )
⟶. 36⁰ + 54⁰+ ∠c = 180⁰
⟶. 90⁰ + ∠c = 180⁰
⟶. ∠c =
Hope it helps
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Second method
∠c = 90⁰ ( vertically opposite angle)
_____________________
Given
∠1 = ∠2
To find
∠3 = ?
∠4 = ?
Solution
⟶ ∠1 + ∠2 + 58⁰ = 180⁰. ( angle sum property)
⟶ ∠1 + ∠1 + 58⁰ = 180⁰
⟶ 2∠1 = 180⁰- 58⁰
⟶ ∠1 =
⭐ ∠1 = ∠2 = 61⁰
⟶ ∠1 + ∠3 = 180⁰
⟶ 61⁰ + ∠3 = 180⁰
⭐∠3 =
⭐∠4 =
Hope it helps
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