2010012808 | math4u.vsb.cz

SubArea:

Level:

Project ID:

2010012808

Source Problem:

Accepted:

0

Clonable:

1

Easy:

1

A regular nonagon

A B C D E F G H I

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

B D G I

. (See the picture.)

α = 100^{\circ}; β = 80^{\circ}; γ = 80^{\circ}; δ = 100^{\circ}

α = 110^{\circ}; β = 80^{\circ}; γ = 80^{\circ}; δ = 90^{\circ}

α = 110^{\circ}; β = 70^{\circ}; γ = 70^{\circ}; δ = 110^{\circ}

α = 120^{\circ}; β = 80^{\circ}; γ = 80^{\circ}; δ = 120^{\circ}