find a b c ab+54=7a please answer fast
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and Angles: In this chapter students will study the properties of the angle formed when two lines intersect each other and properties of the angle formed when a line intersects two or more parallel lines at distinct points. The chapter starts from zero level, the first topic of the chapter being Basic Terms and Definitions.
Acute angle: Measures between 0°° and 90°°.
Right angle: Exactly equal to 90°°.
Obtuse angle: Angle greater than 90°° but less than 360°°.
Reflex angle: Angle greater than 180°° but less than 360°°.
Two angles whose sum is 90°° are called complementary angles.
Two angles whose sum is 180°° are called supplementary angles.
Adjacent angles, linear pair of angles and vertically opposite angles are other important topics in this chapter.