Page 662 - Basic College Mathematics with Early Integers

S E C T I O N 9.2 I PLANE FIGURES AND SOLIDS 639

53. Find the radius of the sphere. 54. Find the radius of the sphere.
d 26 miles d 78 cm

55. Saturn has a radius of approximately 36,184 miles. 56. A sphere-shaped wasp nest found in Japan had a
What is its diameter? radius of approximately 15 inches.What was its
diameter? (Source: Guinness World Records)

Review

Perform each indicated operation. See Sections 1.3, 1.6, 4.2, and 4.3.

57. 21182 + 21362 58. 4(87)

59. 4(3.14) 60. 217.82 + 219.62

Concept Extensions

Determine whether each statement is true or false. See the Concept Check in this section.

61. A square is also a rhombus. 62. A square is also a regular polygon.

63. A rectangle is also a parallelogram. 64. A trapezoid is also a parallelogram.

65. A pentagon is also a quadrilateral. 66. A rhombus is also a parallelogram.

67. Is an isosceles right triangle possible? If so, 68. In your own words, explain whether a square is also
draw one. a rhombus.

69. The following demonstration is credited to the Place the points of the triangle together. Notice
mathematician Pascal, who is said to have developed that a straight line is formed.What was Pascal trying
it as a young boy. to show?
Cut a triangle from a piece of paper.The length of
the sides and the size of the angles are unimportant.
B
Tear the points off the triangle as shown. A C

B

A C