Palindrome in BOTH base 10 and base 8

What’s the side length x of the hexagon?

What’s the length of EF?

(Updated) What’s the area of triangle ABC?

Area of rectangle = ?

What's the value of n?

Size of square = ?

Length of x = ?

Can you solve this probability question?

Area of square = ?

How long does it take?

Two Tangent Theorem - proof

Can you find the required list of positive integers?

What's the length of the red line?

What's the ratio of the radius of the two circles?

Orange area = ?

Area of square = ?

Area of the yellow part = ?

Radius = ?

Size of required angle = ?

What's the length of the hypotenuse?

Think outside the quarter circle

Solve for the required angle

Can you get the target number, using these numbers at most once, with +-×÷ operations only?

What’s the length of AK?

What’s the perimeter of DEF?

What’s the area of the shaded region?

Can you get the target number, using these numbers at most once, with +-×÷ operations only?

How many tuples that satisfy these equations?

Find area of the highlighted section. The entire shape is symmetric along the middle vertically.