D The diagram shows an ornament which is made of wire. It consists of a regular pentagon, ABCDE, of side 4cm, five equal semicircles with diameter 4 cm and an outer circle, centre 0. Each semicircle touches the outer circle as shown. (a) Find the length of the perpendicular from O to AB.

D The diagram shows an ornament which is made of wire. It consists of a regular pentagon, ABCDE, of side 4cm, five equal semicircles with diameter 4 cm and an outer circle, centre 0. Each semicircle touches the outer circle as shown. (a) Find the length of the perpendicular from O to AB.

Elementary Geometry For College Students, 7e

7th Edition

ISBN:9781337614085

Author:Alexander, Daniel C.; Koeberlein, Geralyn M.

Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.

Chapter9: Surfaces And Solids

Section9.3: Cylinders And Cones

Problem 21E: The oblique circular cone has an altitude and a diameter of base that are each of length 6 cm. The...

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Question

E
The diagram shows an ornament which is made of wire.
It consists of a regular pentagon, ABCDE, of side 4cm, five equal semicircles with diameter 4 cm
and an outer circle, centre O.
Each semicircle touches the outer circle as shown.
(a) Find the length of the perpendicular from O to AB.

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