76 | Larger circle radius of annulus (given area and smaller circle radius) | |

77 | Smaller circle radius of annulus (given area and larger circle radius) | |

78 | Area of ellipse (given major and minor axes) | |

79 | Major axis or transverse diameter of ellipse (given area and minor axis) | |

80 | Sum of interior angles of polygon (given number of sides) | |

81 | Number of sides of a simple closed polygon (given sum of internal angles) | |

82 | Median line length of trapezoid (given lengths of the parallel sides) | |

83 | Base of Trapezoid (given median line length and the other base) | |

84 | Interior angle of equilateral polygon (given number of edges) | |

85 | Length of internal common tangent of two circles (given distance between centers and radius) | |

86 | Exterior common tangent of two circles (given distance between centers and radius) | |

87 | Area of a convex quadrilateral (given diagonals and angle) | |

88 | Diagonal length of a convex quadrilateral (given area,angle and another diagonal) | |

89 | Area of Trapezoid (given lengths of parallel sides and height) | |

90 | Length of one parallel side of trapezoid (given area, base and height) | |

91 | Height of Trapezoidal (given area and lengths of parallel sides) | |

92 | Area of circle (given radius) | |

93 | Radius of circle (given area) | |

94 | Perimeter of circle (given radius) | |

95 | Radius of circle (given perimeter) | |

96 | Area of circular sector (given radius and angle) | |

97 | Radius of circular sector (given area and angle) | |

98 | Central angle of circular sector (given area and radius) | |

99 | Area of rhombus using trigonometry (given edge and angle) | |

100 | Area of triangle (given two sides and angle) | |