Объяснение:
4.
∠ABD=100°
∠СВD=4∠ABC
∠ABC=∠ABD-∠CBD
∠ABC=100-4∠ABC
∠ABC+4∠ABC=100
5∠ABC=100
∠ABC=100:5
∠ABC=20°
∠СВD=4×20=80°
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Answers & Comments
Объяснение:
4.
∠ABD=100°
∠СВD=4∠ABC
∠ABC=∠ABD-∠CBD
∠ABC=100-4∠ABC
∠ABC+4∠ABC=100
5∠ABC=100
∠ABC=100:5
∠ABC=20°
∠СВD=4×20=80°