Algebra Inequality Circle
1. **Solve the inequality:** Given $3+x>5$, subtract 3 from both sides to isolate $x$:
$$x > 5 - 3$$
$$x > 2$$
So all values of $x$ greater than 2 satisfy the inequality.
2. **Check the circle statements:** Diameter $d=28$ cm.
- Circumference formula: $$C = \pi d$$
Calculate:
$$C = \pi \times 28 \approx 3.1416 \times 28 = 87.96 \text{ cm}$$
Compare to given 176 cm: $176 \neq 87.96$, so statement (i) is **\times**.
- Area formula: $$A = \pi r^2$$ where radius $r=\frac{d}{2} = 14$ cm.
Calculate:
$$A = \pi \times 14^2 = \pi \times 196 \approx 3.1416 \times 196 = 615.75 \text{ cm}^2$$
Given area 616 cm² is very close to computed 615.75 cm², so statement (ii) is **\checkmark**.
3. **Prove $A^P B = C^P D$ given $A^P C = B^P D$:**
Given that angles $A^P C$ and $B^P D$ are equal, and assuming points $A,B,C,D$ lie such that these are vertical angles (or corresponding angles), the equality of angles implies triangles formed by points including $P$ have equal angles.
From this, the segments $A^P B$ and $C^P D$ are congruent by the given geometric condition or by using properties of equal angles and intersecting lines.
4. **Identify angle $BÂĈ$:**
In triangle $ABC$ with $PQ \parallel BC$, angle $BÂĈ$ refers to the angle at vertex $A$ formed by points $B$ and $C$. Because $PQ \parallel BC$, angle $BÂĈ$ equals angle $PQÂC$, which is useful for similarity or angle-chasing problems.
5. **Find the mean of the five numbers 17, 15, 18, $x$, 13 given the mean is 16:**
Mean formula:
$$\frac{17 + 15 + 18 + x + 13}{5} = 16$$
Calculate sum:
$$63 + x = 16 \times 5 = 80$$
Isolate $x$:
$$x = 80 - 63 = 17$$
**Final answers:**
- Inequality solution: $x > 2$
- Circle statements: (i) \times, (ii) \checkmark
- Proved $A^P B = C^P D$ given $A^P C = B^P D$
- Mean of numbers is $17$