• juliebean@lemm.ee
    link
    fedilink
    arrow-up
    11
    ·
    2 months ago

    if we assume the bottom right corner is a right angle and is the center of the arc, then it is solvable in the manners that others here have already described. if either of those is not the case, and the image itself doesn’t state, then there is insufficient information to solve it.

  • TheSlad@sh.itjust.works
    link
    fedilink
    arrow-up
    11
    arrow-down
    1
    ·
    edit-2
    2 months ago

    24 and 7 make a pythagorean triple with 25 as the hypotenuse. If the problem uses one pythagorean triple, it probably uses another, so I assume x is 15, and the radius is 20.

  • Visstix@lemmy.world
    link
    fedilink
    arrow-up
    9
    arrow-down
    1
    ·
    edit-2
    2 months ago

    Well the drawing is wrong. I measured it with a ruler and it should be 9

  • xmunk@sh.itjust.works
    link
    fedilink
    arrow-up
    9
    arrow-down
    2
    ·
    2 months ago

    I assume you need to calculate the red triangle’s hypotenuse but it seems like there are too many degrees of freedom to lock down any of the other sides or angles of the triangle including X unless I’m missing some hack involving chords and reflected angles.

  • double_quack@lemm.ee
    link
    fedilink
    English
    arrow-up
    1
    ·
    edit-2
    1 month ago

    Sequence of lines to focus on to get to the answer

    making the BOLD ASSUMPTION that the angle of the arch is 90deg (the bottom right corner of your diagram), then the dashed lines will lead you to the value of the bold line.

    If the original assumption is correct, then the answer is 15.

  • ramble81@lemm.ee
    link
    fedilink
    arrow-up
    1
    arrow-down
    1
    ·
    2 months ago

    The two red lines are at a right angle, you can connect them and solve for the hypotenuse using the normal a^2 + b^2.

    At this point you now have a second triangle that contains the X you want. Also, since the outer shape is a quarter-circle (assumed) you know that the corner in the bottom right is 90 degrees which makes the two side equal in length.

    Since it’s an equilateral triangle, and you know the hypotenuse, you can back it out with c^2 = 2a^2 and solve it that way.