题目内容
附加题:
(1)计算:
+
=______;
(2)如图,已知∠1=65°15',∠2=78°30',求∠1+∠2和∠3.
(1)计算:
1 |
a |
2 |
a |
(2)如图,已知∠1=65°15',∠2=78°30',求∠1+∠2和∠3.
(1)
+
=
;
(2)∵∠1=65°15',∠2=78°30',
∴∠1+∠2=65°15'+78°30'=143°45'.
∠3=180°-(∠1+∠2)
=180°-143°45'
=36°15'.
故答案为
、36°15'.
1 |
a |
2 |
a |
3 |
a |
(2)∵∠1=65°15',∠2=78°30',
∴∠1+∠2=65°15'+78°30'=143°45'.
∠3=180°-(∠1+∠2)
=180°-143°45'
=36°15'.
故答案为
3 |
a |
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