13. A hole is drilled in a block of wood as shown in the sketch. The hole is 3/4 of the total depth of the wood. The total depth of the block of wood is 13/16 in.

How deep is the hole?

Hole

The depth of hole is 0.609 inches.

Given, the total depth of the block of  wood is   inches.

Since the hole is of the total depth, so the depth of the hole will be,

Or,

Hence the depth of hole is 0.609 inches.

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< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

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