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1.	The diameter of a circle is 12.6 cm. State, the length of its radius.
Answer» Diameter of the circle = 12.6 cm ∴ Radius = 1/2 diameter = 1/2 x 12.6 cm = 6.3 cm

The diameter of a circle is 12.6 cm. State, the length of its radius.

Answer»

Diameter of the circle = 12.6 cm

∴ Radius = 1/2 diameter = 1/2 x 12.6 cm

= 6.3 cm

Discussion

2.	Use the figure given below to fill in the blanks :(i) R is the …… of the circle.(ii) Diameter of a circle is …… .(iii) Tangent to a circle is … .(iv) EF is a …… of the circle.(v) …… is a chord of the circle.(vi) Diameter = 2 x …..(vii) ……. is a radius of the circle.(viii) If the length of RS is 5 cm, the length of PQ = ……(ix) If PQ is 8 cm long, the length of RS =…..(x) AB is a ….. of the circle
Answer» (i) center (ii) PQ (iii)AB (iv) secant (v) CD (vi) radius (vii) RS (viii) 10 cm (ix) 4 cm (x) tangent.

Use the figure given below to fill in the blanks :(i) R is the …… of the circle.(ii) Diameter of a circle is …… .(iii) Tangent to a circle is … .(iv) EF is a …… of the circle.(v) …… is a chord of the circle.(vi) Diameter = 2 x …..(vii) ……. is a radius of the circle.(viii) If the length of RS is 5 cm, the length of PQ = ……(ix) If PQ is 8 cm long, the length of RS =…..(x) AB is a ….. of the circle

Answer»

(i) center

(ii) PQ

(iii)AB

(iv) secant

(v) CD

(vi) radius

(vii) RS

(viii) 10 cm

(ix) 4 cm

(x) tangent.

Discussion