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Question

Two circles of diameter 5 cm and 7 cm touch each other internally, the distance between their centres will be –

(a) 1 cm

(b) 2 cm

(c) 3 cm

(d) 4 cm

WBBSE Class X Mathematics Theorem Related To Circle 01 Mark 2024

Answer

(a) 1 cm

Explanation:

Radii are 5\over2 = 2.5 cm and 7\over2 = 3.5 cm.

For internal contact,

Distance between centres = difference of radii

= 3.5 − 2.5

= 1 cm.

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