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Geometry Problems 81 - 90
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![Geometry Problem 81-90](geometry_problems_81_90.jpg) |
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![Triangle area](../problem/p081_triangle_area_17.jpg) |
Proposed Problem 81. Area of a
triangle, side, inradius, circumradius. |
![Contact triangle area](../problem/p082_contact_triangle_17.jpg) |
Proposed Problem 82. Area of the
Contact Triangle, inradius, circumradius. |
![](../problem/p083_contact_triangle_17.jpg) |
Proposed Problem 83. Area of the
Excircle Contact Triangle, exradius, circumradius. |
![](../problem/p084_contact_triangle_17_.jpg) |
Proposed Problem 84. Contact
Triangles Areas, Incircle, Excircle, Inradius, Exradius. |
![](../problem/p085_contact_triangle_17.jpg) |
Proposed Problem 85. Contact
Triangles Areas, Incircle, Excircle. |
![](../problem/p086_extouch_triangle_17.jpg) |
Proposed Problem 86. Intouch and
Extouch Triangles, Areas. |
![Quadrilateral area problem](../problem/p087_quadrilateral_area_17.jpg) |
Proposed Problem 87. Area of
Quadrilaterals and Midpoints of Diagonals. |
![Math problem](../problem/p088_quadrilateral_area_17.jpg) |
Proposed Problem 88. Triangle and Quadrilateral Areas, Midpoints. |
![Math problem](../problem/p089_equal_area_17.jpg) |
Proposed Problem 89. Triangles of equal area, Midpoints. |
![Geometry problem](../problem/p090_quadrilateral_area_17.jpg) |
Proposed Problem 90.
Quadrilateral and Triangle Areas, Midpoints. |
![Geometry Problems 91-100](geometry_problems_91_100.jpg)
![Geometry Problems 71-80](geometry_problems_71_80.jpg) |
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