(1) ∠x を求めなさい.
50° A x B 26° C 106° D E |
(2) ∠x を求めなさい.
50° A x B 39° C 122° D E |
(3) ∠x を求めなさい.
75° A x B 27° C 131° D E |
(4) ∠x を求めなさい.
62° x 51° 36° |
(1) ∠x を求めなさい.
50° A x B 26° C 106° D E よって,∠CED = ∠BDC − ∠C = 106 − 26 = 80 ∠CEDは△ABEの頂点Eにおける外角だから∠CED = ∠A+∠B ∠CED = ∠A + ∠x = 80 よって,∠x = 30 |
(2) ∠x を求めなさい.
50° A x B 39° C 122° D E よって,∠CED = ∠BDC − ∠C = 122 − 39 = 83 ∠CEDは△ABEの頂点Eにおける外角だから∠CED = ∠A+∠B ∠CED = ∠A + ∠x = 83 よって,∠x = 33 |
(3) ∠x を求めなさい.
75° A x B 27° C 131° D E よって,∠CED = ∠BDC − ∠C = 131 − 27 = 104 ∠CEDは△ABEの頂点Eにおける外角だから∠CED = ∠A+∠B ∠CED = ∠A + ∠x = 104 よって,∠x = 29 |
(4) ∠x を求めなさい.
62° x 51° 36° 対頂角 = 180−(∠x+51) = 180−(62+36) ∠x = 47 |