Grade 10 · Geometry
The algebra, geometry, and SAT items US students search most. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: congruent
They are opposite when two lines cross.
Answer: 180°
A line is a straight angle.
Answer: 180°
A quadrilateral sums to 360°.
Answer: congruent
They sit inside the parallels on opposite sides of the transversal.
Answer: 90°
Perpendicular lines form right angles.
Answer: 90°
Supplementary angles add to 180°.
Answer: at least two congruent sides
Base angles are congruent.
Answer: prove two triangles congruent
Corresponding parts of congruent triangles are congruent.
Answer: opposite / hypotenuse
Sin = O/H.
Answer: adjacent / hypotenuse
Cos = A/H.
Answer: opposite / adjacent
Tan = O/A.
Answer: the longest side, opposite 90°
Never use a leg as the hypotenuse in SOHCAHTOA.
Answer: 3 (with hypotenuse 5)
Keep the ratio.
Answer: x, x√3, 2x
The side opposite 30° is the shortest.
Answer: equal, and hypotenuse leg√2
It is isosceles.
Answer: inverse trig (sin⁻¹, cos⁻¹, tan⁻¹)
Calculators have SIN⁻¹.
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