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AC = AB + BC =13+8 ⇒ AC = 21 cm |
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AC + CB = AB ⇒ AC = AB – CB = 13−8 ⇒ AC = 5 cm |
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Definition | Figure |
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A Line is made up of infinite number of points and its only dimension is length. It can be infinitely extended in both directions. |
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A Ray is similar to a line, however, it can be infinitely extended in one direction only. |
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A Line Segment is a line confined between 2 fixed points. A line segment has a defined length. |
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Parallel Lines are lines that never meet, i.e., they are uniformly separated by the same distance throughout. |
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Perpendicular Lines are lines that intersect at right angles. | ![]() |
Concurrent Lines are lines that intersect at the same point. | ![]() |
Definition | Figure |
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A Plane is a flat surface with only length and width as its dimensions. It is a figure made up of infinite number of lines. |
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Triangles are shapes bound by 3 non parallel lines. |
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Quadrilaterals are shapes bound by 4 lines. |
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A Polygon is any n-sided figure, where n is a finite integer greater than 2. Note: Triangles and Quadrilaterals are Polygons as well. |
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A Circle is a closed figure wherein the distance between the centre and any point on the surface is constant. | ![]() |
Definition | Figure |
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Acute Angle 0° < θ < 90° 0 rad < θ < π/2 rad |
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Right Angle 90° π/2 rad |
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Obtuse Angle
90° < θ < 180° π/2 rad < θ < π rad |
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Straight Angle = 180° = π rad |
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Reflex Angle
180° < θ < 360° π rad < θ < 2π rad |
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Complementary angles are two angles whose sum is 90°
∠AEB + ∠CED = 90°.
∴ ∠AEB and ∠CED are complementary angles. |
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Supplementary angles are two angles whose sum is 180° ∠AEB + ∠CED = 180°. ∴ ∠AEB and ∠CED are supplementary angles. |
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Linear Pair are two adjacent angles which are on the same side of a line and equal to 180° ∠ADC and ∠BDC are on the same side of the line AB. ∴ ∠ADC and ∠BDC are a linear pair. |
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