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  • 22-06-2021
  • Mathematics
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In the accompanying diagram, ABC is isosceles, BC is extended to D. AB = AC. and M

In the accompanying diagram ABC is isosceles BC is extended to D AB AC and M class=

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kirabowen15
kirabowen15 kirabowen15
  • 22-06-2021

Answer:

m∠ACD = 130

Step-by-step explanation:

If ABC is an isosceles, AB = AC and m∠A = 80°, then m∠B and m∠C is equal to 50°.

This is because angles in a triangle adds up to 180°.

180° - 80° = 100°/2 = 50°

∴ m∠ACD = 130°, this is because the interior opposite angles in a triangle is supplementary to the opposite exterior angle:

50° + 80° = 130°

Or

Angles on a straight line adds up to 180°.

180° - 50° = 130°

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