(1) ∠x を求めなさい.
75° A x B 34° C 136° D E |
(2) ∠x を求めなさい.
x 53° 40° 40° |
(3) ∠x を求めなさい.
55° A 33° B 41° C x D E |
(4) ∠x を求めなさい.
37° 32° x 43° |
(1) ∠x を求めなさい.
75° A x B 34° C 136° D E よって,∠CED = ∠BDC − ∠C = 136 − 34 = 102 ∠CEDは△ABEの頂点Eにおける外角だから∠CED = ∠A+∠B ∠CED = ∠A + ∠x = 102 よって,∠x = 27 |
(2) ∠x を求めなさい.
x 53° 40° 40° 対頂角 = 180−(∠x+40) = 180−(53+40) ∠x = 53 |
(3) ∠x を求めなさい.
55° A 33° B 41° C x D E ∠BEC = 55 + 33 = 88 ∠BDCは△DCEの頂点Dにおける外角だから∠BDC = ∠C+∠BEC ∠BDC = 41+88 = 129 |
(4) ∠x を求めなさい.
37° 32° x 43° 対頂角 = 180−(∠x+32) = 180−(37+43) ∠x = 48 |