Tirone
16.11.2019 •
Mathematics
Complete the proof of the exterior angle theorem
given: ∠adc is an exterior angle of ∆bcd.
prove: m∠b+m∠c=m∠adc
1. ∠adc is an exterior angle of δbcd= given
2. = triangle sum of theorem
3. ∠adc and ∠bdc form a linear pair=
4. =
5. =
6. =
7. ∠adc=m∠b+m∠c = subtraction property of equality
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Ответ:
Part B: 45 minutes
Step-by-step explanation:
x+y=75
y= -x+75
-x -x
y+15=x
-x+75+15=x
90/2=2x/2
x=45
y+15=45
-15 -15
y=30