<div class="wj-math wj-math-block"><span class="wj-equation-number"><span class="wj-equation-paren wj-equation-paren-open">(</span>1<span class="wj-equation-paren wj-equation-paren-close">)</span></span><code class="wj-math-source wj-hidden" aria-hidden="true">A = \pi \cdot r^2</code><wj-math-ml class="wj-math-ml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi>A</mi><mo>=</mo><mi>π</mi><mo>·</mo><msup><mi>r</mi><mn>2</mn></msup></math></wj-math-ml></div><div class="wj-math wj-math-block"><span class="wj-equation-number"><span class="wj-equation-paren wj-equation-paren-open">(</span>2<span class="wj-equation-paren wj-equation-paren-close">)</span></span><code class="wj-math-source wj-hidden" aria-hidden="true">C = 2\pi r</code><wj-math-ml class="wj-math-ml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi>C</mi><mo>=</mo><mn>2</mn><mi>π</mi><mi>r</mi></math></wj-math-ml></div><div class="wj-math wj-math-block" data-name="quadratic-formula"><span class="wj-equation-number"><span class="wj-equation-paren wj-equation-paren-open">(</span>3<span class="wj-equation-paren wj-equation-paren-close">)</span></span><code class="wj-math-source wj-hidden" aria-hidden="true">x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}</code><wj-math-ml class="wj-math-ml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mi>x</mi><mo>=</mo><mfrac><mrow><mo>-</mo><mi>b</mi><mo>±</mo><msqrt><mrow><msup><mi>b</mi><mn>2</mn></msup><mo>-</mo><mn>4</mn><mi>a</mi><mi>c</mi></mrow></msqrt></mrow><mrow><mn>2</mn><mi>a</mi></mrow></mfrac></math></wj-math-ml></div><div class="wj-math wj-math-block" data-name="navier-stokes"><span class="wj-equation-number"><span class="wj-equation-paren wj-equation-paren-open">(</span>4<span class="wj-equation-paren wj-equation-paren-close">)</span></span><code class="wj-math-source wj-hidden" aria-hidden="true">\frac{\mathrm{D} \mathbf{u}}{\mathrm{D} t} =
\frac 1 \rho \nabla \cdot \boldsymbol{\sigma} + \mathbf{f}.</code><wj-math-ml class="wj-math-ml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><mfrac><mrow><mi mathvariant="normal">D</mi><mi mathvariant="bold">u</mi></mrow><mrow><mi mathvariant="normal">D</mi><mi>t</mi></mrow></mfrac><mo>=</mo><mfrac><mn>1</mn><mi>ρ</mi></mfrac><mo>∇</mo><mo>·</mo><mi mathvariant="bold-italic">σ</mi><mo>+</mo><mi mathvariant="bold">f</mi><mo>.</mo></math></wj-math-ml></div><p>Apple<span class="wj-equation-ref"><wj-equation-ref-marker class="wj-equation-ref-marker" type="button" data-name="quadratic-formula">quadratic-formula</wj-equation-ref-marker><span class="wj-equation-ref-tooltip" aria-hidden="true"></span></span></p><p>Banana cherry<span class="wj-equation-ref"><wj-equation-ref-marker class="wj-equation-ref-marker" type="button" data-name="quadratic-formula">quadratic-formula</wj-equation-ref-marker><span class="wj-equation-ref-tooltip" aria-hidden="true"></span></span> Gooseberry</p><p>Pineapple<span class="wj-equation-ref"><wj-equation-ref-marker class="wj-equation-ref-marker" type="button" data-name="navier-stokes">navier-stokes</wj-equation-ref-marker><span class="wj-equation-ref-tooltip" aria-hidden="true"></span></span>Blueberry</p><p><strong>FAIL</strong></p><p>EMPTY[[math]]<br>[[/math]]</p><p>Durian[[eref]]</p>