Site map
Tests
Lessons
Formulas
Calculators
Math Calculators, Lessons and Formulas
It is time to solve your math problem
mathportal.org
HW Help (paid service)
Math Lessons
Math Formulas
Calculators
Geometry
Triangles
Isosceles triangle
Isosceles triangle
ans:
syntax error
C
DEL
ANS
±
(
)
÷
×
7
8
9
–
4
5
6
+
1
2
3
=
0
.
auto next question
evaluate answers
calculator
Question 1:
1 pts
Find the value of $x.$
$8cm$
$7cm$
$4cm$
$2cm$
Question 2:
1 pts
Find the value of $x.$
$x=$
$150^{\circ}$
$60^{\circ}$
$30^{\circ}$
$75^{\circ}$
Question 3:
1 pts
In an isosceles triangle, the angles across from the congruent sides are congruent. Also the sides across from congruent angles are congruent.
Question 4:
1 pts
Find the value of $y.$
$y=90^{\circ}$
$y=60^{\circ}$
$y=45^{\circ}$
$y=30^{\circ}$
Question 5:
2 pts
Find the value of $x$ and $y.$
$x$ and $y$ are, respectively, equal to
$26^{\circ}$ and $52^{\circ}.$
$52^{\circ}$ and $26^{\circ}.$
$52^{\circ}$ and $52^{\circ}.$
$26^{\circ}$ and $26^{\circ}.$
Question 6:
2 pts
What is the lateral side of an isosceles triangle with area $20$ unit$^{2}$ and base $10$ units?
$b=\sqrt{21}$
$b=\sqrt{31}$
$b=\sqrt{41}$
$b=\sqrt{51}$
Question 7:
2 pts
What is the area of an isosceles triangle with base $b$ of $8 cm$ and lateral $a$ side $5 cm?$
Area $=$
$40cm^{2}$
$12cm^{2}$
$36cm^{2}$
$24cm^{2}$
Question 8:
2 pts
$x=70^{\circ}$ and $y=5.$
Question 9:
3 pts
What is the lateral side of an isosceles triangle such that its height $h$ ( perpendicular to its base $b$) is $4 cm$ shorter than its base $b$ and its area is $30 cm^{2}$?
$a=$
$\sqrt{41}cm$
$\sqrt{51}cm$
$\sqrt{61}cm$
$\sqrt{71}cm$
Question 10:
3 pts
$\vartriangle ABC$ and $\vartriangle BCD$ are isosceles triangles. Find the size of angle $BDE$.
$\measuredangle BDE =$
$24^{\circ}$
$18^{\circ}$
$15^{\circ}$
$12^{\circ}$
Question 11:
3 pts
$\vartriangle ABC$ and $\vartriangle CDE$ are isosceles triangles. Find the size of angle $CED$.
$\measuredangle CED =$
$76^{\circ}$
$38^{\circ}$
$19^{\circ}$
$9^{\circ}$
Question 12:
3 pts
$\vartriangle ABC$ is a triangle whose $AB=AC =20cm$ and angle $BAC=30$ degree. Which expression can be used to find the area of the triangle?
Area $=$
$\dfrac{1}{2}\cdot 20 \cdot 20 \cdot \sin 75^{\circ}$
$2\cdot 20 \cdot 20 \cdot \sin 30^{\circ}$
$\dfrac{1}{2}\cdot 20 \cdot 20 \cdot \sin 30^{\circ}$
$20 \cdot 20 \cdot \sin 30^{\circ}$
submit test
Pre-algebra
Polynomials
Linear equations
Quadratic equations
Radicals
Exponents and Logarithms
Trigonometry
Algebra 2
Geometry
Solid Figures
Triangle
Triangle classification
Triangle formulas
Equilateral triangle
Right triangle
Isosceles triangle
Mixed problems
Quadrilateral
Classifying quadrilaterals
Quadrilateral angles
Quadrilateral formulas
Square
Rectangle
Rhombus and Parallelogram
Trapezoid
Quadrilaterals on the coordinate plane
Area of quadrilaterals - mixed problems
Circle
Circle formulas
Inscribed and Central Angles
Circle and Pythagorean Theorem
Triangles and Circles
Circles and Quadrilaterals
Circles and Hexagons
Mixed problems
Polygons
Number of diagonals
Interior angles
Angles of regular polygons
Area and perimeter of regular polygons