What is the sum of the exterior angles of any convex polygon?

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In a circle with centre $O$ , the central angle $∠ A O B = 13 0^{\circ}$ . What is the inscribed angle $∠ A C B$ on the major arc?
In a circle with centre $O$ , the central angle $∠ A O B = 6 4^{\circ}$ . What is the inscribed angle $∠ A C B$ on the major arc?
In a circle with centre $O$ , the central angle $∠ A O B = 14 0^{\circ}$ . What is the inscribed angle $∠ A C B$ on the major arc?
A right triangle has legs of 9 cm and 12 cm. What is the length of its hypotenuse?
A circle has a circumference of $10 π$ cm. What is its area?
Two similar triangles have corresponding sides in the ratio $2 : 3$ . The smaller triangle has an area of 20 cm $^{2}$ . What is the area of the…