few_shots: 
Example 1:
Concept/skill: 
Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of trigonometric ratios for acute angles.

Problem/activity:
Find the general solution for:
$${\mathrm{cos}\left({\pi\over2}+x\right)=\mathrm{tan}{\pi\over4}}$$


Answer: 
No. This problem does not directly teach how side ratios in right triangles lead to definitions of trigonometric ratios. Instead, it involves solving a trigonometric function.

Example 2:
Concept/skill: 
Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).

Problem/activity:
Task
Solve the quadratic equation
$$ x^2 = (2x - 9)^2 $$
using as many different methods as possible.


Answer: 
No. This task does not involve an equation in two variables. There is only one variable, x.

Example 3:
Concept/skill: 
Construct a tangent line from a point outside a given circle to the circle.

Problem/activity:
Task
Suppose $A$ is an angle with vertex $P$, as pictured below:
[IMG]
Draw a circle with center $P$ and with  radius $r \gt 0$.  Explain why the circle
meets each ray of angle $A$ in a single point.  Label these points $Q$ and $R$ respectively.
Draw circles with centers $Q$ and $R$ respectively and radius $r$.  These circles meet at $P$ and a second point to be labelled $B$.
Show that ray $\overrightarrow{PB}$  bisects angle $P$.


Answer: 
No. This task does not involve drawing lines that are tangent to circles. The only line that may be drawn is the ray between points P and B.

Now, determine whether the following problem or activity can enable students to understand the concepts or skills in the provided description.

shot_info: fl_problem_001894_neg_0

HS_0

im_task_000870_neg_0

HS_1

im_task_001160_neg_0

HS_2
standard_description: Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement:
- An angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a “one-degree angle,” and can be used to measure angles.
- An angle that turns through n one-degree angles is said to have an angle measure of n degrees.
problem_activity: Problem 1
Below are three angles,
$$\angle A$$
,
$$\angle B$$
and
$$\angle C$$
.
[IMG]
Which angle has the greatest measure? How do you know?
Problem 2
Estimate the measure of each angle in Anchor Task 1.
Using a 180° protractor, find the exact measure of each angle in Anchor Task 1.
Problem 3
Use a 180° protractor to find the measure of each angle in degrees.
| 1.            |https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png|  |https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png| image:: https://d21royfkw9g4l6.cloudfront.net/Qz0c1pghJblJxPPnWMKvDA_8OLHZR.png | 1.            |https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png|  |https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png| image:: https://d21royfkw9g4l6.cloudfront.net/RokQx2LZhsF2CTQWAJkzyW_JH4LC6.png |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1.            |https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png|  |https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png| image:: https://d21royfkw9g4l6.cloudfront.net/NLbOmHYZToXkxj9ilDgQH6_DXQEEI.png | 1.            |https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png|  |https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png| image:: https://d21royfkw9g4l6.cloudfront.net/hJ5Lr0W5n0ZLLZ0IDJqfdN_5ZB0NT.png |
Use a 180° protractor to measure the labeled angles in each figure.
[IMG]


aligns: yes