Unit 8 Practice A

Find the approximate circumference of a circle with a radius of 10 inches.

Note: C = 3.14d

Find the exact area of a circle with a diameter of 15 meters.

Note: A = 𝜋r²

Give the most specific name for line AE in the picture below.

Identify a radius in the picture below.

Find the length of minor arc PQ in circle R with a diameter of 9 yards. _{Use a calculator to round your answer to the nearest tenth of a yard.}

Note: Arc Length = (^{central angle}/₃₆₀) 𝜋d

Find the measure of arc JL and identify the arc as a major arc, minor arc, or semi-circle.

Determine whether segment AB is tangent to circle C. Give justification for your answer by showing your work.

Note: a² + b² = c²

Find the area of the sectors formed by the obtuse angle DFE.

_{Use a calculator to round to the nearest tenth.}

Note: sector area = (^{central angle}/₃₆₀) 𝜋r²

Determine the length of AB. Show your work for full credit.

Note: Tangents are congruent.

Determine the measure of minor arc CB. Show your work for full credit.

Note: Arc AD is congruent to arc DB in the diagram. Once you solve for x, you still need to determine the measure of arc CB.