For the following questions answer them individually
Ratio of the principle and the amount after1 year is 10:12. Then the rate of interest per annum is :
A solid cone of height 9 cm with diameter ofits base 18 cm is cut out froma wooden solid sphere of radius 9 cm. The percentage of wood wasted is
Thelength of the chordofa circle is 8 cm and perpendicular distance betweencentre and the chord is 3 cm. Then the radius of the circle is equal to
In $$\traingle$$ ABC, $$/angle BAC =90^\circ$$ and AB=$$\frac{1}{2}$$ BC Then the measure of $$\angle ACB$$ is