Algebra 1

posted by .

In triangle ABC ,if <A and <B are acute angles, and sin A=10/13 what is the value of cos A?

  • Algebra 1 -

    sinA = 10/13.
    This is assumed to be a rt triangle.
    sinA = 10/13 = Y/r,
    X^2+Y^2 = r^2,
    X^2+(10)^2 = (13)^2,
    x^2 = 169-100 = 69,
    X = 8.3.

    cosA = X/r = 8.3/13.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. ALGEBRA 1

    If x and 3x-10 represent the measure of the acute angles of a right tringle find the value of x. THANKS Let's take it step by step. A triangle has 3 angles in it. Those three angles, when added together, is 180. In a right triangle, …
  2. maths

    Choose three options which are true: a) an angle of 150 degrees is equivalent to 2pie/3 radians. b) Cos 0 = cos (0 – pie/2) for al values of 0. c) Sin 0 = cos (0 – pie/2) for all values of 0. d) If triangle ABC has a right angle …
  3. maths

    Choose three options which are true: a) an angle of 150 degrees is equivalent to 2pie/3 radians. b) Cos 0 = cos (0 – pie/2) for al values of 0. c) Sin 0 = cos (0 – pie/2) for all values of 0. d) If triangle ABC has a right angle …
  4. Trigonometry

    in triangle abc, if sin c= (sin a + sin b )/ ( cos a + cos b ) prove that triangle abc is a right-angle triangle.
  5. math

    In triangle ABC if <A and <B are acute angles and sin 10/13 , what is the value of cos A?
  6. math

    In triangle ABC if <A and <B are acute angles and sin 10/13 , what is the value of cos A?
  7. math

    In triangle ABC ,if <A and <B are acute angles, and sin A=10/13 what is the value of cos A
  8. geometry

    In triangle ABC, if <A and <B are acute angles, and sin A 10/13 . What is the value of cos A?
  9. Geometry Please Help With One Multiple Choice

    Write the ratios for sin A and cos A. {picture is of a right triangle, ABC. segment AC is 8, segment AB is 17, and segment CB is 15.} sin A=15/17, cos A=8/17 sin A=15/8, cos A=8/17 sin A=15/17, cos A=8/15 sin A=8/17, cos A=15/17
  10. geometry

    Let the incircle of triangle $ABC$ be tangent to sides $\overline{BC}$, $\overline{AC}$, and $\overline{AB}$ at $D$, $E$, and $F$, respectively. Prove that triangle $DEF$ is acute. I have tried proving that triangle DEF's angles were …

More Similar Questions