デジブ用英語
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- ➋ Geometry 4th Kyu
1
Let the line l be the axis of symmetry for the figure shown on the right. (1) (2) (3) Find the vertex that is symmetric to vertex B with respect to the line l. Find the side that is symmetric to side DE with respect to the line l. What is the total number of axis of symmetry?
2
In the diagram, a circle is inscribed in a square with sides of
4a cm . Include units in your answer. Use ¼ to denote pi.
(1) (2) (3)
What is the area of the square in cm2? What is the area of the circle in cm2? What is the area of the shaded region in cm2?
3
Right-angled triangle ABC is shown on the right. A solid is created by rotating the triangle around the straight line l. (1) (2) Draw a sketch of the solid figure. What is the shape of the cross section when this solid is cut vertically through its axis of rotation? Answer using the most appropriate name. (3) Express the volume of the solid in terms of ¼ .
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