55. Converta: \( \begin{array}{ll}\text { a) } 98 \mathrm{~m}^{2} \text { em centímetros quadrados. } & \text { d) } 2,1 \mathrm{hm}^{2} \mathrm{em} \text { metros quadrados. } \\ \text { b) } 151 \mathrm{~m}^{2} \text { em decâmetros quadrados. } & \text { e) } 665,3 \mathrm{~m}^{2} \text { em quilômetros quadrados. } \\ \text { c) } 7 \mathrm{~cm}^{2} \text { em milimetros quadrados. } & \text { f) } 2150,1 \mathrm{~mm}^{2} \text { em decímetros quadrados. }\end{array} \)

If a circle has a radius of 5 cm, what is its area? Show your calculations.

Graph the line containing the given pair of points and find the slope. \( (-6,0),(-7,-4) \)

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 \( \pi=\frac{22}{7} \) )

Quick CHECK 1.1 In circle \( O, \overline{P J} \) and \( \overline{T G} \) are diameters \( \begin{array}{ll}\text { a. } \mathrm{m} \overparen{G J} & \text { b. } \mathrm{m} \overparen{P T} \\ \begin{array}{ll}\text { d. } \mathrm{m} \angle P G T & \text { e. } \mathrm{m} \angle J G T\end{array} \\ \begin{array}{ll}\text { g. } \mathrm{m} \angle G P T & \text { h. m } \overparen{G J T}\end{array} \\ \begin{array}{l}\text { j. What can be concluded about }\end{array}\end{array} \)

Explain the relationship between equal chords and their distances from the center of a circle.