A solid has 12 vertices and 30 edges. How many faces does it have?
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Points P , Q and R are on a circle such that ∠PQR = 40° and ∠QRP = 60° . Then the subtended angle by arc QR at the centre is
The average weight of P, Q and R is 71 kg. If the average weight of P and Q be 66 kg and that of Q and R be 76.5 kg, then the weight (in kg) of Q is.
What is the average of all the one digit, two digit and three digit natural numbers?
What is the value of √121 + √12321 + √1234321 + √123454321?
If √(cosec2A - 1) = x, then the value of x is
In a Rhombus ABCD, measure of angle CAB is 25°, what is the measure of angle ABC?
Area of _____ equals square of its side.