Math Drills
Perimeter of Composite Figures
A-3Calculation (Rectangle and Semicircle)
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What this worksheet covers
- Worksheet
- Perimeter of Composite Figures
The way round a figure joining straight lines and arcs is traced one piece at a time and added, as Calculation. Beyond a rectangle side pushed in, one pushed out, and a shape carrying both, there appear a Track Shape with a semicircle at each end, an S made by joining offset semicircles, a large semicircle with two small ones beneath it, a shape enclosed by quarter circles, and a star of four arcs facing inward.
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The perimeter is only the line a pencil travels when it goes once round without leaving the edge. A side where a semicircle is pushed in or out has been replaced by the arc and no longer survives as a straight line. In such a shape, all four sides of the rectangle standing together in the expression means the replaced side was never erased.
Counting arcs and straight lines one at a time now spreads across eight kinds of shape. In the next unit, Prisms and Cylinders, the counting moves from tracing across a plane to counting the vertices, edges and faces of a solid.
- Rectangle − Semicircular Notch1 question
- Rectangle + Semicircle on One Side1 question
- Convex and Concave Mixed1 question
- Track Shape1 question
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More worksheets in this unit
Circumference of a CircleCircumference of a Circle Calculation
Circumference of a CircleCircumference of a Circle Word Problems
The Circumference of Various CirclesThe Circumference of Various Circles Calculation
Perimeter of Composite FiguresPerimeter of Composite Figures Calculation (S-Curves, Stars, and More)
