emharriss18 emharriss18

01-11-2018
Mathematics

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what is the measure of BCD

what is the measure of BCD class=

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choixongdong choixongdong

01-11-2018

Triangle ABC has AB = BC. So it's isosceles triangle. So <A = <C

Given: <B = 80

Sum of interior in a triangle = 180

<A = <C = 1/2(180 - 80)

= 1/2(100)

= 50

<BCA + <BCD = 180 (supplement angles are equal 180)

so

<BCD = 180 - <BCA

<BCD = 180 - 50

<BCD = 130

Answer

<BCD = 130°

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