pre calc

posted by .

EAch of 3 circles touch the other 2.
Circle A=radius 8cm
Circle B=radius 4cm
Circle c=radius 1cm
A triangle is formed by connecting the centers of the 3 traingles. Determine the largest angle for the traingle and which circle is the largest angle?
Also what is the area?
Please help really stumped!=[

  • pre calc -

    Wouldn't the triangle have sides of 12, 9, and 5 ?
    So you given 3 sides,
    Use the cosine law I just showed you in your previous post.

    For the area use Heron's law
    A = √(s(s-a)s-b)(s-c), were a,b, c are the sides and
    s = (1/2)perimeter.
    s = (12+9+5)/2 = 13
    s-a = 13-12 = 1
    s-b = 13-8 = 5
    s-c = 13-5 = 8

    area = √(13x1x5x8) = √520 = appr. 22.8 cm^2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Pre-Calc

    Describe the conditions necessary for the two circles, where circle a has a larger radius than circle b, to have no points of intersection, while each circle is entirely in the exterior of the other circle.
  2. Pre-Calc (Circles)

    Describe the conditions necessary, where circle A has a larger radius than circle B, for the two circle to have no points of intersection, while circle B is entirely in the interior of circle A.
  3. Math

    Circle C has radius 4 inches. Circle D had radius 9 inches. These two circles are connected. Point A,B,and E are points of tangency. Find AB. From point C to point D(which is the radius of circle C plus the raduis of circle D) it is …
  4. pre calc

    each of three circles touches the other 2.circle A has a radius of 8 cm. circle B has a radius of 4 cm.circle C has a radius of 1 cm.a triangle is formed by connecting the centers of the 3 triangles. determine the largest angle for …
  5. Geometry

    A dartboard consists of five concentric circles. The radius of the smallest circle is about 1 inch. The radius of the second circle is about 3 inches longer. The radius of the third circle is about 1 inch longer than the previous circle. …
  6. maths

    there are two circles touching each other at one point. The radius of bigger circle is 4cm and smaller is 1cm. A small third circle is drawn which touches both the first two circles at one point each. A common tangent passes through …
  7. GEOMETRY(CIRCLE)

    Three circles with different radii have their centers on a line. The two smaller circles are inside the largest circle, and each circle is tangent to the other two. The radius of the largest circle is 10 meters. Together the area of …
  8. GEOMETRY CIRCLES PLEASE

    1.An isosceles triangle with each leg measuring 13 cm is inscribed in a circle . if the altitude to the base is 12 cm find the radius of the circle 2. Circles a and b are tangent at point c. p is on circle a and q is on circle b such …
  9. GEOMETRY CIRCLE

    1.An isosceles triangle with each leg measuring 13 cm is inscribed in a circle . if the altitude to the base is 12 cm find the radius of the circle 2. Circles a and b are tangent at point c. p is on circle a and q is on circle b such …
  10. Pre-Calc (Circles). Please help :(

    Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn as shown dividing the circle of radius 5 into five regions: a circle of radius 1 and 4 annuuli (rings). What is the probability that a point chosen randomly from within …

More Similar Questions