Kąt przyległy:
∡a + ∡b = 180⁰
∡b = ∡a + 30⁰
∡a + ∡b - 180⁰
∡a + ∡a + 30⁰ = 180⁰
2∡a + 30⁰ = 180⁰
2∡a = 150⁰
∡a = 75⁰
∡b = 75⁰ + 30⁰
∡b = 105⁰
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Kąt przyległy:
∡a + ∡b = 180⁰
∡b = ∡a + 30⁰
∡a + ∡b - 180⁰
∡a + ∡a + 30⁰ = 180⁰
2∡a + 30⁰ = 180⁰
2∡a = 150⁰
∡a = 75⁰
∡b = ∡a + 30⁰
∡b = 75⁰ + 30⁰
∡b = 105⁰