Plane and solid geometry . ihedral angles. (Hint. See proof of § 192.) Ex. 1205. Two dihedral angles whose faces are parallel, each to each,are either equal or supplementary dihedral angles. (Hint. See proof of§ 108.) Ex. 1206. A dihedral angle has the same numerical measure as itsplane angle. (Hint. Proof similar to that of § 358.) Ex. 1207. Two dihedral angles have the same ratio as their plane angles. Ex. 1208. Find a point in a plane equidistant from three givenpoints not lying in the plane. Ex. 1209. If a straight line intersects one of two parallel planes, itmust, if suthciently prolonge
Plane and solid geometry . ihedral angles. (Hint. See proof of § 192.) Ex. 1205. Two dihedral angles whose faces are parallel, each to each,are either equal or supplementary dihedral angles. (Hint. See proof of§ 108.) Ex. 1206. A dihedral angle has the same numerical measure as itsplane angle. (Hint. Proof similar to that of § 358.) Ex. 1207. Two dihedral angles have the same ratio as their plane angles. Ex. 1208. Find a point in a plane equidistant from three givenpoints not lying in the plane. Ex. 1209. If a straight line intersects one of two parallel planes, itmust, if suthciently prolonged, intersect the other also. (Hint. Use theindirect method and apply §§ 663 and ^Qi\.^ Ex. 1210. If a plane intersects one of two parallel planes, it must, ifsufficiently extended, intersect the other also. (Hint. Use the indirectmethod and apply § 652.) 328 SOLID GEOMETRY Proposition XXII. Theorem 678. If a straight line is perpendicular to a plane,every plane containing this Hive is perpendicular to thegiven
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