# math

posted by .

Triangle DEF is such that DF=8cm,EF=5.5cm and its area is 11 root2 cm^2. Find angle EFD.

• math -

Area = 0.5*Ef*DF*sinF = 11 cm^2.
0.5*5.5*8*sinF = 11
22*sinF = 11
sinF = 0.5
F = 30o.

## Similar Questions

1. ### geomerty

The following triangles, Ä ABC and Ä DEF, are congruent. abc 67.38degree 12cm lenght 22.62degree b5cm,l,13cm Find the lengths of all missing sides and measures of all angles for both triangles. Include correct units with each of …
2. ### Trigonometry/Geometry

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, …
3. ### Trigonometry/Geometry - Law of sines and cosines

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, …
4. ### maths

a triangle has sides 8cm and 5cm and an angle of 90 degrees between them. Calculate the smallest angle of the triangle.
5. ### Precalculus

In most geometry courses, we learn that there's no such thing as "SSA Congruence". That is, if we have triangles ABC and DEF such that AB = DE, BC = EF, and angle A = angle D, then we cannot deduce that ABC and DEF are congruent. However, …
6. ### Math

Which congruence statement says the same thing as triangle ABC is congruent to triangle DEF?
7. ### Math

Which congruence statement says the same thing as triangle ABC is congruent to triangle DEF?
8. ### math

a triangle has sides 8cm and 5cm and an angle of 90 between them. calculate the smallest angle of the triangle
9. ### Mathematics

A triangle has sides 8cm and 5cm and an angle of 90° between them. Calculate the smallest angle of the triangle.
10. ### maths

A triangle has sides 8cm and 5cm and an angle of 90 degrees between them. Calculate the smallest angle of the triangle.

More Similar Questions