EM-2172

Arc length and sector area

E Math · Secondary 4 · Medium · Arc length and sector area

A circular sector has centre

O

, radius 9 cm and angle

80^\circ

. A rhombus is formed by joining the endpoints of the radii with two equal chords inside the sector. Find the area of the sector, giving your answer correct to 1 decimal place.

56.6 cm $^2$
45.2 cm $^2$
72.3 cm $^2$
81.0 cm $^2$

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