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Angle, Parallelogram and trapezoid - Coggle Diagram
Angle
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Trapezoid, Rhombi, and kites
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Sectors and circles
sectors of a circle
A sector is said to be a part of a circle made of the arc of the circle along with its two radii. It is a portion of the circle formed by a portion of the circumference (arc) and radii of the circle at both endpoints of the arc. The shape of a sector of a circle can be compared with a slice of pizza or a pie. 
central angle
A central angle is the angle that forms when two radii meet at the center of a circle. Remember that a vertex is the point where two lines meet to form an angle. A central angle's vertex will always be the center point of a circle. A central angle is formed at A.
arc angle
An arc measure is an angle the arc makes at the center of a circle, whereas the arc length is the span along the arc. This angle measure can be in radians or degrees, and we can easily convert between each with the formula π radians = 180° π r a d i a n s = 180 ° .
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Transformations
Formula for finding the ratio of area for similar figures- If two polygons are similar, then their areas are proportional to the square of the scale factor.
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