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Please help me find the measure of all the angles and give an explanation

Please help me find the measure of all the angles and give an explanation-example-1
User Medri
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1 Answer

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The measure of the numbered angles are:

a) m∠1 = 75⁰ b) m∠2 = 35⁰ c) m∠4 = 70⁰

d) m∠6 = 75⁰ e) m∠9 = 70⁰

f) m∠10 = 110⁰ g) m∠12 = 70⁰

h) m∠14 = 75⁰

How the numbered angles are calculated.

From the figure

a||b and m.and l are transversals.

∠7 = 110⁰ and ∠11 = 75⁰

a) ∠1 = ∠11(corresponding ∠s)

∠1 = 75⁰

∠7 + ∠8 = 180(linear angles)

110 + ∠8 = 180

∠8 = 180 - 110

= 70⁰

∠8 + ∠11 + ∠5 =>180(sum of int. ∠s of a ∆)

70 + 75 + ∠5 = 180

∠5 = 180 - 145

∠5 = 35⁰

m∠2 = m∠5(vertical angles)

m∠2 = 35⁰

c) m∠4 = m∠8(alternate interior angles)

m∠4 = 70⁰

d) m∠6 = m∠1(vertical angles)

m∠6 = 75⁰

e) m∠9 = m∠4(corresponding ∠s)

m∠9 = 70⁰

f) m∠10 = m∠7(vertical angles)

m∠10 = 110⁰

m∠12 = m∠4= m3(vertical angles and corresp. ∠s)

m∠12 = 70⁰

h) m∠14 = m∠11(vertical angles)

m∠14 = 75⁰

User Alexander Hansen
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