The perimeter of equilateral triangle DEF is 24 cm.
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Triangle</h3>
A triangle is a polygon with three sides and three angles. Types of triangles are<em> equilateral, isosceles, obtuse, scalene</em>.
Given that triangle ABC is equilateral, also triangle DEF is equilateral.
DE = DF = EF = 10 - 1 - 1 = 8 cm
Perimeter of DEF = 8 + 8 + 8 = 24 cm
The perimeter of equilateral triangle DEF is 24 cm.
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Answer:
x = 2
Step-by-step explanation:
Angles ABN and NBC are adjacent angles and sum up to angle ABC
- 23x + 63x + 3 = 175
- 86x = 175 - 3
- 86x = 172
- x = 172/86
- x = 2
Answer:
y=1/3x-8
Step-by-step explanation:
y+5=1/3(x-9)
y=1/3x-9/3-5
y=1/3x-3-5
y=1/3x-8
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Answer:
60 student tickets and 40 adult tickets were sold
Step-by-step explanation:
Let s represent student tickets and a adult tickets, then the system of equations can be written as
s - a = 20 →(1)
2s + 4a = 280 → (2)
Multiply (1) by 4 and add to (2) to eliminate a
4s - 4a = 80 → (3)
Add (2) and (3) term by term
6s = 360 ( divide both sides by 6 )
s = 60
Substitute s = 60 into (1)
60 - a = 20 ( subtract 60 from both sides )
- a = - 40 ( multiply both sides by - 1 )
a = 40
Thus
60 student and 40 adult tickets were sold.
