2010012807 | math4u.vsb.cz

SubArea:

Level:

Project ID:

2010012807

Source Problem:

Accepted:

0

Clonable:

1

Easy:

1

A regular dodecagon

A B C D E F G H I J K L

is inscribed in a circle. Find the measures of all interior angles of the quadrilateral

B F I L

. (See the picture.)

α = 90^{\circ}; β = 75^{\circ}; γ = 90^{\circ}; δ = 105^{\circ}

α = 90^{\circ}; β = 60^{\circ}; γ = 80^{\circ}; δ = 130^{\circ}

α = 80^{\circ}; β = 75^{\circ}; γ = 90^{\circ}; δ = 115^{\circ}

α = 90^{\circ}; β = 105^{\circ}; γ = 90^{\circ}; δ = 105^{\circ}