Pada suatu lingkaran terdapat busur \( \widehat{P Q}, \widehat{R S}, \widehat{T U} \), dan \( \widehat{V W} \). Diketahui keempat busur tersebut memiliki panjang \( \widehat{P Q}> \) panjang \( \widehat{R S}> \) panjang \( \widehat{T U}> \) panjang \( \widehat{V W} \). Sudut pusatnya O Jika pada masing-masing busur tersebut dibuat sudut pusat yang bersesuaian, maka menghadap sudut apakah sudut pusat terkecil tersebut? a. \( \angle \mathrm{POQ} \) b. \( \angle \mathrm{ROS} \) c. \( \angle \mathrm{TOU} \) d. \( \angle V O W \) I

If the diameter of a circle is doubled, how does it affect the circumference?

The length of a minor are \( A B \) of a circle centre \( O \) is 10 cm . The arc \( A B \) subtends an angle of 1.25 radians at \( O \). Calculate the area of the minor sector \( A O B \). \[ \text { Area }=\frac{\theta}{360} \times T r^{2} \]

Pasa for \( (-2,4) \) y \( m=3 \)

A cylindrical container of internal radius 10.5 cm has a hemispherical base. The container has water up to a height of 30.5 cm . Calculate the surface area of the container that is in contact with water. (Take \( \pi=\frac{22}{7} \) )

57. Paulo pretende recobrir uma parede retangular com ladrilhos quadrados, cada um com área igual a \( 40 \mathrm{~cm}^{2} \). Esses ladrilhos são vendidos em caixas contendo 20 unidades por \( R \$ 15,00 \) cada caixa. Sabendo que essa parede tem \( 6 \mathrm{~m}^{2} \) e considerando que os ladrilhos serão instalados sem espa- ços entre eles, determine ov valor mínimo que Paulo deverá investir para comprar caixas de ladri- Ihos suficientes para recobrir essa parede.