9. the polygons are similar but not necessarily drawn to scale.162 81 9419. the length of the hypotenuse of a 30° -60° -90° is 7. find the perimeter. 21. what are the ratios for sin a and cos a? 23. what is the area of the figure? 31. what is the area in terms of pi? 33. use formulas to find the lateral area and surface area of the given prism. round your answer to the nearest whole number. 46. in the figure, mde=106° and mbc =62°. what is m of angle a? 48. what is the standard equation of the circle in the graph? 49. what is the equation of the circle with centre (-4, -3) that passes through point (6, 2)?