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LESSON
OBJECTIVES
TRAPEZOIDIs a quadrilateral with exactly one pair of parallel sides.
ISOSCELES TRAPEZOIDIs a trapezoid with congruent LEGS.
CHARACTERISTICS OF ISOSCELES TRAPEZOID*Both pairs of base angles are ≅.
( )*The diagonals are ≅.
( )
1)
2)
*JKLM is a trapezoid because there is exactly one pair of parallel sides.
Compare the length of the legs.
*JKLM is an isosceles trapezoid because the legs are congruent.
QRST is a quadrilateral with vertices Q(3, 2), R(1, 6), S(4, 6), T(6, 2).3) Verify that QRST is a trapezoid.
4) Determine whether QRST is an isosceles trapezoid.
Q
R S
T
*QRST is a trapezoid because there is exactly one pair of parallel sides.
Compare the length of the legs.
*QRST is an isosceles trapezoid because the legs are congruent.
Is parallel to the bases and the measure is onehalf of the sum of the bases.
5) Find EF 6) Find EH
P
7) Find t, XY and QP
8) RSTV is a trapezoid with bases RV and ST and median MN. Find x if MN = 60,ST = 4x 1, and RV = 6x + 11.
9) Find TS if QR = 22 and XY = 15
10)
11) Find m F
12) Find m E
13) Find m G
m 1 =m 2 =m 3 =m 4 =
15) Use the information in the trapezoid below to find the value of x, y, m T, m R, and m P.
14) Find x and the m C.
16) JN = 10.6, and NL = 14.8. Find KM.
17) Find the value of a so that PQRS is isosceles.
Find the length of the median of each trapezoid.1) 2)
EXAMPLES
Solve for x. Each figure is a trapezoid.3) 4)
Find the length of the median of each trapezoid.
5) 6)
NOTES on LESSON 86 TRAPEZOIDS
Find the length of the base indicated for each trapezoid.
7) 8)
Solve for x. Each figure is a trapezoid.9) 10)
Find the length of the base indicated for each trapezoid.11) Find FG 12) Find WV
Solve for x. Each figure is a trapezoid.15) 16)
Find the measurement of the angle indicated for each trapezoid.
17) Find m C 18) Find m T
HW on LESSON 86 p442p443 10, 12, 1319 all
Find the measurement of the angle indicated for each trapezoid.13) 14)