The answer is Rhombus because it is two equilateral triangles that can create a quadrilateral. A quadrilateral has exactly four sides and it is also a polygon. A rhombus has four equal sides and it is any parallelogram with equal sides including a square. A rhombus is like a diamond. In your question, the craft project that has a two equilateral triangle that tapes together and creates an equilateral, I picture it as a diamond and the diamond is including in the family of a rhombus. All side have equal length, opposite side is parallel and the other opposite angles are equal.
2.9411764706
but if they're telling you to round, then round (:
Percentages are sometimes difficult to understand. It is important to remember that whichever integer you are using to convert (true or inverse) it is important to use the same integer for the entire formula only changing the operation from quotient to product.
AED 340
4/5=4÷5=.2 (20%) inverse=.8 (80%)
x=(222+50)/.8
x=272/.8
x=340
*proof*
340×.8=272 (20% discount, 4/5=.2)
272-50=222 (AED 50 gift cert.)
13² = 169
8² = 64
169 - 64 = 105
Square root of 105 = 10.247cm