Top network posts

• 12 Four equal circles intersect: What is the area of the small shaded portion and its height
• 11 In a club with 99 people, everyone knows at least 67 people. Prove there's a group of 4 people where everyone knows each other
• 8 Does $\triangle ABC$ exist such that $\triangle ABC \sim \triangle DEF$, with $D, E, F$ being the incentre, centroid, orthocentre of $\triangle ABC$?
• 6 Number of four-digit numbers with nonzero leading digit in two ways
• 6 How many $3$-digit numbers have a digit sum of $21$?
• 5 What is the value of $a + b$ if $a\sqrt{b} = BC$ in right triangle $\Delta ABC$?
• 5 PMF of throwing a die 4 times
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