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Geometry..(Circle)..need help....

1. A plane passes through the common center of two concentric spheres. Describe the intersection of the plane and the two spheres.

2. Find the length of a chord that is 3cm from the center of a circle with radius 7cm.

3. Points E, F, G, H, and J lie on circle with center point of O.

a. measure of arc EF = ? and measure of arc EHF = ?

b. suppose segment JH is congruent to segment HG, state the theorem that supports the conclusion that acr JH is congruent to arc HG.

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Attachment 4864 (for #3)

Have a nice day...^^