Question
ABC is an equilateral triangle with sides of 42cm. Find
the difference between its in-radius and circum-radius.Solution
In-radius of an equilateral triangle = a√3/6 units where a = side of the equilateral triangle Therefore, the in-radius of the given equilateral triangle = (42√3/6) = 7√3 cm Circum-radius of the given equilateral triangle = 2 × 7√3= 14√3 cm required difference= 14√3cm - 7√3cm= 7√3cm
?, 15, 45, 225, 1575, 14175
60   61    57   66    ?      75    39
...55, 71, 119, 199, 311, ?
What will come in place of (?) Question mark in the given number series.
500, 489, 467, 434, 390, 335, ?
110, 156, 212, ?, 354, 440
23, 27, 39, 59, ?, 123
74, 84, 64, 104, ?, 184
6, 7, 16, 51, 208, ?
What will come in place of (?) question mark in the given number series.
16, 24, 51, 115, 240, ?
99, 101, 107, 131, 251, ?
