21) A frame is 15 in by 25 in aud is of uniform widtls. The inside of the frame leaves \( 75 \% \) of the total area available for the picture. What is the width of the frame?

Define la diferencia entre un arco mayor y un arco menor en un círculo.

A cylinder with a radius of 4 cm and a height of 9 cm has the same volume as a cone with a radius of 3 cm . What is the height of the cone? A. 12 cm B. 16 cm D. 36 cm D. 48 cm .

Circle \( P \) has a radius of \( r \) and circle \( Q \) has a radius twice as large. How many times greater is the area of circle \( Q \) than the area of circle \( P \) ? A. 2 B. \( 2 r \) C. 4 D. \( 4 r \)

555. Длина прямоугольника \( 7 \frac{3}{5} \) см. Его периметр равен периме квадрата со стороной 6 см. Найдите ширину прямоуго ника.

What is the definition of an inscribed circle in a triangle?