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    Angle 2 Maths

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    tranthihuong205

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    Angle 2 Maths

    Uploaded by

    tranthihuong205
    14 views1 page

    Original Title

    Angle.2.Maths

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    Copyright:

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    14 views1 page

    Angle 2 Maths

    Uploaded by

    tranthihuong205

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    We are working with Cambridge Assessment International Education towards endorsement of this title.

    5 Angles and constructions

    Worked example 5.2


    Work out x and y.
    B

    40° 45°
    y°

    E
    C
    105°
    D
    x°
    A

    Answer

    PL
    x is an exterior angle of triangle ABD so x = 40 + 105 = 145°
    y is an exterior angle of triangle BCD
    Angle BDC = 180° − 105° = 75° because angles on a straight line = 180°
    So y = 75 + 45 = 120°

    Exercise 5.2
    M
    The diagrams in this exercise are not drawn to scale.
    1 Calculate the sizes of angles a, b and c.

    80° b 134°
    20°
    20° c
    45° a
    86°
    SA

    2 a Work out each of the exterior angles b Work out the size of the exterior
    shown in this triangle. angle x in this quadrilateral.

    x
    c
    70°
    65°

    67° b
    a 80°

    112
    Original material © Cambridge University Press 2021. This material is not final and is subject to further changes prior to publication.

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